Not just latency, but framerate too.
I wanted to build a gaming PC that would double as a Windows dev machine, so I wanted more pixels than 1080p.
Even with my 3090, I can only reasonably do 1440p @ 240Hz, and even then I lose some frames on Fortnite with graphics settings turned down. 4k was out. Thankfully Alienware makes a very nice 1440p 240Hz monitor.
How color accurate is the screen? How well does it handle HDR? Does it ever get blurry? If you've ever tried run Linux, either bare or VM, did it handle dpi correctly?
I haven't tested for color accuracy or HDR. No Linux. Does not get "blurry" while I'm gaming.
My only recent comparisons are my new 16" M1 MBP and my 1440p Dell U2719 monitor (provided by work). Colors are wildly better than the Dell (of course) and it seems close to the MBP, although the MBP looks better out of the box of course.
At time of purchase, the only viable 240Hz 1440p options were this Alienware or the Samsung Odyssey G7. The Alienware offered better latency, and it was 40% off on the Dell website for some reason, so that's the one I went with.
TFTCentral does pretty thorough reviews, they seem to like the Alienware. https://tftcentral.co.uk/reviews/dell_alienware_aw2721d
I actually like extra wide displays. There are few interesting options like that but the rest seems to be dominated by low color, low resolution, low latency stuff.